Reversing mechanism for roll-ramming apparatus.



H. P. MACDONALD. REVERSING MECHANISM FOR ROLL RAMMING APPARATUS.

. APPLICATION FILED APR. 22, 1913. 1,074,882.

v 2 SHEETS-SHEET 1.

Patented Oct. 7, 1913.

9 W7 Z/ZZZWA/ H. P. MACDONALD.

REVERSING MECHANISM FOR ROLL RAMMING APPARATUS.

APPLICATION FILED APR. 22, 1913.

Patented Oct. 7, 1913.

2 SHEETS-SHEET 2.

WITNESSES All'y;

UNITED STATES PATENT OFFICE.

HARRY P. MACDONALD, OF MONTCLATR, NEW JERSEY, ASSIGNOR TO THE SNEAD 8a CO. IRON WORKS, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

REVERSING MECHANISM FOR ROLL-RANKING APPARATUS.

Specification of Letters Patent.

Patented Oct. '7, 1913.

Original applicato'n filed January 22, 1912, Serial No. 672,645. Divided and this application filed April 22,

. 1913. Serial No. 762,898.

To all whom it may concern:

Be it known that I, HARRY P. MACDONALD,

a citizen of the United States, residin at Montclair, in the county of Essex and tate of New Jersey, have invented certain new and useful Improvements in Reversing Mechanism for Roll-Ramming Apparatus,

nism which is simple in character and effective in operation and in which shocks and strains on the operating parts are reduced to a minimum; the provision of a device of the character described in which binding and sticking of the operating parts is prevented; and the provision of improved reversing mechanism having cooperative relation with respect to means for limiting the movement of the ramming roll positively.

The foregoing together with such other objects as may hereinafter appear or are incident to the invention, I attain by means of a structure which I have illustrated in the accompanying drawings in preferred form. In the drawings Fig. 1 is a plan view of roll ramming apparatus in which my improved reversing mechanism is embodied; Fig. 2 is a side elevation of a portion of the device shown in Fig. 1; Fig. 3 is a plan view of the reversing mechanism drawn on an enlarged scale and Fig. 4 is a side elevation of Fig. 3. i

In order that a better understanding may be had of the reversing mechanism and its operation, ming apparatus will first be given. Referring particularly to Figs. 1 and 2 it will be seen that the ramming apparatus com-- prises a ramming roll 7 carrying a framework 8 which is provided with a rack 9 driven by the shaft 10 through a pinion 11. The roll 7 is guttered or grooved at each end and rides upon and is supported by the angle-iron tracks 12, the grooves ena brief description of the ram-.

gaging the upright flanges or legs of the angles. The shaft 10 is driven by a motor 13, gearing 14, shaft 15 and gearing 16, all of the driving mechanism being mounted in the carriage or framework 17. The rack 9 is carried directly on the pinion 11 and is maintained in proper position by means of the rollers 18 mounted in plates 18f carried on the shaft 10. By means of this mechanism the roll 7 is 'reciprocated and passes back and forth alon the tracks 12 between which the flask not shown) is placed.

For controlling the movement of the roll 7 I have provided my improved automatic reversing mechanism which is adapted to reverse the motor 13 through the controller 20 which-may be of any preferred form. Referring to Fig. 3, it. will be noted that a portion of the end of the driving shaft. 10 is screw'threaded and is provided with two nuts 21 and 22 which are keyed to the shaft or fastened in any other preferred manner, such nuts constituting two fixed abutments. Mounted on the threaded portion of the shaft between the abutments and having threaded engagement with such ortion, is a floating member or nut 23 w ich is held against rotative movement by means of the rods 24 which have sliding engagement with a f pulley or sheave 25 loosely mounted on the shaft 10 and connected to the arm or shaft 26 of the controller 20 by the flexible connection 27 comprising a air of straps preferably composed of leather or other suitable material. The nut 21 is rovided with a pair of springs 28 locate on opposite sides of the shaft and the nut 22 is similarly provided with spring 28' (see Fig. 4;). b

The operation of the reversing mechanism is as follows: As the shaft 10 is rotated in I a direction to drive the roll forward, the 95 floating nut 23 moves longitudinally on theshaft until it contacts with the springs 28 carried on the abutment 21, this engagement causing the nut 23 to rotate with the shaft. The nut 23 imparts-rotative movement to the controller shaft 26 through the rods 24, sheave 25, and connection 27, and the rotation of the shaft 26 operates the controller to reverse the motor and the roll 7 is moved in the reverse direction. As the motor from the abutment 21 toward the abutment 22 until it comes into contact with the springs 28, at which time the controller is again operated in the manner above described to stop the motor. It will be understood that as the nut 23 moves, the rods 24 slide freely in the sheave 25.

By providing the springs 28 and 28 binding or sticking of the nut 23 to either of the abutments 21 or 22 is prevented, and rotative movement is imparted to the nut without jolting or jarring the controller and without causing strain on the parts thereof, so that breakage of the operative parts is prevented. I

It will be observed that springs 29 and 30 are mounted on the framework 17, at substantially opposite ends thereof, and that the rack 9 is provided at each end with a downwardly projecting stop or abutment 31,

said abutments being adapted to take against the springs 29 and 30 at the extremes of movement of the roll 7. The

springs serve as yielding bufl'ers which stop the movement of the ramming roll and take the strain from off the motor and the driving connections, said springs also serving to assist the motor when the latter is reversed by giving the roll an initial impulse in the reverse direction. The spring buflers also have cooperative relation with the reversing mechanism. The reversing mechanism is actuated substantially at the time when one of the abutments 31 takes against either the spring 29 or the spring 30. The springs yield sufliciently to insure the throwing of the controller, but at the same timestop the roll so that breakage of the reversing mechanism and the controller parts is prevented. This i of particular advantage in connection with the type of reversing mechanism shown wherein the nut 23 comes into contact with two fixed abutments and thereafter rotates with the main operating shaft of the apparatus. The slowing up of the roll by the action of the spring bufi'ers prevents the banging of the nut against the abutments and also we vents the nut from sticking.

In order to operate the controller manually, regardless of the position of the ram- .floating member and the abutments.

in which event the fixed abutments can be so positioned on the shaft that when the spring buffers are engaged by the stops 31, the controller will turn to neutral position and stop the motor instead of reversin it. It will be understood that the term fixed abutment does not necessarily define an abutment rigidly and immovably carried by the shaft, the word fixed having reference primarily to the relation between ltfie e latter are fixed relative to the former.

What I claim is: 1. An automatic control mechanism comprising in combination with a driven shaft and a motor for turning the shaft, a fixed abutment carried on the driven shaft, a movable abutment adapted to contact with the fixed abutment, means whereby the rotation of the shaft moves the movable abutment, a controller for the motor, a yielding member between the abutments,

and an operative connection between the movable abutment and the controller.

2. An automatic reversing mechanism comprising in combination a threaded driving shaft and a motor for turning the shaft, a controller, an operating shaft for the controller, a pair of spring abutments on the driving shaft, a floating member on the threaded portion of the driving shaft and adapted to contact with the abutments, and a connection between the floating member and the controller shaft.

3. An automatic reversing mechanism comprising in combination with a threaded driving shaft and a motor for turning the shaft, a controller, an operating shaft for the controller, a pair of abutments on the driving shaft, a floating member on the threaded portlon of the driving shaft and adapted to contact with the abutments, and a flexible connection between the floating member and the controller shaft.

4. An automatic control mechanism comprising in combination with a driven shaft and a motor, a fixed abutment on the driven shaft and rotatable therewith, a movable abutment adapted to contact with the fixed abutment, one of said abutments having a yielding engagement means, a controller for the motor, means whereby the rotation of the shaft moves the movable abutment, and operative connection between the movable abutment nd the controller.

5. automatic reversing mechanism comprising in combination with a threaded driving shaft and a motor for turning said shaft, a controller, an operating shaft for the contro ler, a relatively fixed abutment rotating with the shaft, a floating member on the threaded portion of the driving shaft adapted to contact with the fixed abutment, a second member loosely mounted on the shaft, a connection between said second member and the controller shaft, and a In testimony whereof I have hereunto slip connection between the floating member signed my name in the presence of the two and the second member whereby the floatsubscribed witnesses. ing member is free to move longitudinally HARRY P. MACDONALD.

of the shaft but is prevented from rotating Witnesses:

therewith until it engages with the fixed G. G. GBEENLEE, Jn, abutment. J. A. ARNOLD. 

